If you are looking for payware, try Flight Replicas.
They have several packages, but the Complete Package includes:
1. Early - 95 hp
2. Standard - 150 hp
3. Standard with Carbon-fibre Wheel-Skis - 150 hp
4. Standard with Amphibious Floats - 160 hp
5. L-18 Military - 95 hp
6. L-21 Military (two versions) - 150 hp
7. IFR equipped on Amphibious Floats w. square instrument panel 180 hp
8. Classic Bush Plane on 32 wheels
9. Classic Bush Plane on Edo 2000-type Floats
10. Classic Bush Plane on Federal-type Skis
11. N8050C on 26 wheels 150 hp
12. N8050C on Edo 2000 floats 150 hp
13. N8050C on Federal skis 150 hp
14. Bush Plane on 35 wheels - 150 hp
15. Bush Plane on 32 wheels w. square instrument panel 180 hp
16. Extreme Bush Plane on 35 wheels w. thrust line mod 180 hp
17. Extreme Bush Plane (L-21) on 35 wheels w. square inst. panel - 180 hp
18. Extreme Bush Plane (Experimental) on 36 wheels w. squared wings, droop aileron system, square instrument panel 210 hp
http://www.flight-replicas.com/SuperCub_basepage.htm